Держите на питоне: >>> import random >>> a=[random.random()-.5 for _ in range(15)] >>> a [-0.08813105031810387, -0.19925167389334353, 0.21199613578028587, -0.2231749654431009, 0.4691832091025049, 0.46345647357169517, 0.010257937667007111, 0.35273240144566, -0.34687460084904953, -0.4493362938013362, 0.38332951972960805, -0.06788513815640862, -0.1327044869111158, -0.06695740213237411, -0.4972970918379894] >>> b=[x for x in a if x > 0] >>> b [0.21199613578028587, 0.4691832091025049, 0.46345647357169517, 0.010257937667007111, 0.35273240144566, 0.38332951972960805] >>> len(b) 6